Synthesis of Nano-Wall Like MnO2 Electrode Material by Electrodeposition Method for Enhanced Capacitive Properties

Abstract

Supercapacitors are emerging as an alternative to batteries due to their high-power density, low charging time, safety, electrochemical stability, and long cycle life and manganese dioxide (MnO2) is one of the best electrode materials to prepare supercapacitor. In this regard, the MnO2 as an electrode material was synthesized by using the simplistic electrodeposition method and various characterization techniques were carried out to investigate their physicochemical properties. The scanning electron microscopy illustrates the interconnected nano-wall like morphology of MnO2 thin films, resulting in a larger surface area. This morphology is beneficial for providing more active sites for charge storage and hence leads to a higher capacitance. Therefore, the nano-wall like structure of MnO2 thin films were utilized for the electrochemical measurements and it revealed higher specific capacitance at about 465 F/g for low scan rate of 10 mV/s. Furthermore, even after 500 cycles of voltammetry, the MnO2-based supercapacitor exhibits a higher cycling stability of about 98%.